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DESCRIPTION:
Common knotweed (prostrate knotweed) is a summer annual broadleaf weed which
can thrive even on poor and compacted soil. The cotyledons (seed leaves) are
long, very narrow, rounded at the tip and light green with a white
cast. The true leaves are much broader, emerging from an encircling,
membranous
sheath at the leaf base. The mature plant grows prostrate to
erect with slender, tough stems, which are extensively branched,
giving it a zigzag appearance. The tiny, green flowers with white
or pink margins sit in clusters of two to five on short stalks in leaf
axils.
See UC IPM's Common Knotweed
Pest Note for more information.
Broadleaf ID illustration.
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